In an endothermic reaction, the reaction absorbs heat from the surroundings. An increase in temperature can affect the equilibrium of an endothermic reaction by shifting the equilibrium position.
According to Le Chatelier's principle, which describes the behavior of chemical systems at equilibrium, if a stress is applied to a system in equilibrium, the system will respond in a way that minimizes the effect of the stress. In the case of an endothermic reaction, increasing the temperature is considered a stress.
When the temperature is increased, the system tries to counteract the rise in temperature by absorbing more heat. In an endothermic reaction, heat is one of the reactants. By Le Chatelier's principle, if heat (a reactant) is removed, the equilibrium will shift in the direction that produces more heat.
As a result, increasing the temperature of an endothermic reaction will shift the equilibrium in the forward direction, favoring the formation of products. This shift occurs because the forward reaction is the heat-absorbing reaction, and increasing the temperature helps compensate for the added heat.
It's important to note that the extent of the shift in equilibrium depends on the specific reaction and the temperature coefficient (enthalpy change) of the reaction. Some reactions may be more sensitive to temperature changes than others.